HISTORY:
A female in her 60’s with history of ESRD, diabetes mellitus type 2, hypertension, and gout presented for renal transplant evaluation.
MRI revealed a 1.5 cm lesion of the right kidney suspicious for a renal cell carcinoma. A robotic radical nephrectomy with regional lymphadenectomy was performed.
A 1.4 x 1.3 x 1.2 cm well-circumscribed, solid brown lesion was identified within the superior pole. Negative for hemorrhage or necrosis. Lesion does not involve the renal sinus fat, perirenal fat, or renal vasculature.
GROSS:
What is the most likely diagnosis?
- Eosinophilic Chromophobe Renal Cell Carcinoma
- Renal Oncocytoma
- Low-grade oncocytic tumor
Low-grade oncocytic tumor